Fast diffusion in ZrTiCuNiBe melts

Meyer, A.; Petry, W.; Koza, M.; Macht, M.-P.
November 2003
Applied Physics Letters;11/10/2003, Vol. 83 Issue 19, p3894
Academic Journal
Atomic transport in Zr[sub 41.2]Ti[sub 13.8]Cu[sub 12.5]Ni[sub 10]Be[sub 22.5] and Zr[sub 46.8]Ti[sub 8.2]Cu[sub 7.5]Ni[sub 10]Be[sub 27.5] melts has been investigated with incoherent, quasielastic neutron scattering. From the q dependence of the quasielastic signal an average self-diffusion coefficient of the incoherent scatterers Ni and Ti has been obtained. Values are on a 10[sup -10] m[sup 2] s[sup -1] scale. In contrast to the viscosity, the diffusion coefficient is rather independent of the alloy’s composition. Above the liquidus temperature times scales for Ni and Ti self diffusion and for viscous flow differ by up to two orders of magnitude: It appears, that the smaller atoms diffuse in a relative immobile Zr matrix. © 2003 American Institute of Physics.


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